iommu/amd: Fix kerneldoc comments

Fix W=1 compile warnings (invalid kerneldoc):

    drivers/iommu/amd/init.c:1586: warning: Function parameter or member 'ivrs' not described in 'get_highest_supported_ivhd_type'
    drivers/iommu/amd/init.c:1938: warning: Function parameter or member 'iommu' not described in 'iommu_update_intcapxt'
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200728170859.28143-1-krzk@kernel.orgSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/init.c

@@ -1578,7 +1578,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
 
 /**
  * get_highest_supported_ivhd_type - Look up the appropriate IVHD type
- * @ivrs          Pointer to the IVRS header
+ * @ivrs: Pointer to the IVRS header
  *
  * This function search through all IVDB of the maximum supported IVHD
  */
@@ -1929,7 +1929,7 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 #define XT_INT_VEC(x)		(((x) & 0xFFULL) << 32)
 #define XT_INT_DEST_HI(x)	((((x) >> 24) & 0xFFULL) << 56)
 
-/**
+/*
  * Setup the IntCapXT registers with interrupt routing information
  * based on the PCI MSI capability block registers, accessed via
  * MMIO MSI address low/hi and MSI data registers.